Joint construction and method of forming the same



Sept. 30 1924. 1,510,243

G. PERRY JOINT CONSTRUCTION AND METHOD OF FORMING THE SAME Filed July 14, 1922 Patented Sept. 30, 3.94..

more

eno FRY, @ll .CEQAGQ, ILLINOIS.

JOINT CONWIRUCTIQN AND METHOD OF FURMING THE SAME.

Application flied ll'nly l4, 192:3. Serial No. 575,088.

To all whom it may concern: I

Be it known that I, Gnovnn Pnnnr, a citizen of the United States, residing at Chicago, in the county of Cook and State of 6 Illinois, have invented a certain new and useful Joint Construction and Method of Forming the Same, of which the following is a specification.

This invention is concerned with the man- 1 ufacture of divers articles from certain materials with which dificulty is experienced in attemptin to form, by the join: ing methods common y ployed with other materials, suitable edge seams and intermediate connections between portions.

The primary object of the invention resides in the provision of a novel method of forming narrow edge seams and intermediate connections in the manufacture of en velopes, pockets, containers, holders and various other articles of a similar kind from sheet celluloid and the like. Another important object is the provision in an article of manufacture, of a noveljoint construction which may be formed by the method 3 here presented.

While the foregoing statement is indicative in a general way of the nature or the.

invention, other objects and advantages not so specifically referred to will be appreciated 40 of the invention'other than as the same is defined by the appended claims.

In the drawings- Fig. 1 is a perspective view of a twopocket envelope, illustrating one of the prod ucts obtained by employing the present method of forming edge seams and intermediate connections;

Figs. 2, 3 and 4 illustrate the stages of the method in forming an edge seam between portions; and

' Figs. 5, 6 and 7 illustrate the stages of the I method in forming an intermediate connection between. portlons. V

In the manufacture heretofore of envemediate connections without resorting to.

such expedients as the forming, in the manufacture of envelopes for instance, of a major fold across the sheet of material and minor edge folds to close the edges. This difliculty arises when an attempt is made to join two surfaces of the material along a narrowv area by the application of a liquid substancesuch as a solvent of the materialfor causing adhesion between the surfaces,

and consists of an unavoidably irregular and indefinite spread of the liquid substance between the contacting surfaces due to the capillary attraction vand tension of the smooth surfaces when a liquid is applied thereto. Accordingly, joining of sheet celluloid and the like in the manner above mentioned is impractical because of the resulting irregular connections.

This invention consists in the revision of a novel method for forming slghtly edge seams and intermediate connections between surfaces of celluloid and the like whereby regular connections along narrow or particularly defined areas may be accurately efi'ecte The present method overcomes the difficulty previously outlined by the insertion, between the surfaces to be joined, of a narrow or particularly shaped strip of preferably the same material as that comprising one or both of the parts to be joined.

This stripseparates the surfaces and introduces a break on both sides of the area to be joined whereby the spread of the liquid is confined to the area of the strip. It is found that the solution, when applied to the strip between the surfaces, will spread in the direction of the strip only and that the areas of the two surfaces united by the strip will be consequently, defined by the length and width of the strip. Fig. 1 of the drawing illustrates in perspective a celluloid envelope wherein the edge seams 10 and the intermediate pocket forming con-= nection 11 have been constructed in 8.000111%.

ance with the present method.

' F'gs. 2, 3-and 4 of the drawing illustrate the stages in the method of forming an edge seam. In Fig. 2 is shown the two sheets of celluloid to be joined, the sheets being indicated by the numerals 12 and 13, and the interposed filler strip being indicated by the numeral 14. The opposed surfaces of the sheets are brought into contact with the opposite faces of the filler strip, the edge of one sheet being placed even with the edge of the strip, and the edge of the other being placed to overlie the edge of the strip, as shown in Fig. 3. With the sheets and strip in this position the parts are held firmly together and the liquid celluloid solvent applied with a suitable brush to the upper and lower outside edges 15 of the filler strip the liquid will immediately enter between the contacting surfaces and will spread across the area of contact as defined by the shape of the strip. The overlapped portion 16 of the lower strip may then be trimmed off and as shown in Fig. 4, leaving a neat regular seam 17 which is water and'air-tight and possessed of such strength that the body of. either sheet will fracture under strain before any injury is caused to the seam.

-Fig. 5, Fig. 6 and Fig. 7 of the drawing illustrate the sta es in the method of forming an interme iate connection. In Fig. 5 is shown one of the sheets of celluloid to be joined. It will be noted that this sheet 18 is provided with a row of minute perforations 13 along the line where the connection is intended to be made. The other sheet 20 is shown in Fig. 6. The filler strip 21 is first secured to the sheet 20 alon the line of the proposed connection be ore the two sheets 18 and 20 are assembled for joining. The sheet 18 is then placed on the sheet 20 with the perforations over the filler stri as shown in F ig. 7, and the solvent applied to the apertures by running therealong a suitable brush filled with the solvent. The solvent immediately passes through the apertures and spreads over the surface of contact between the sheet 18 and the upper surface of the filler strip, thereby effecting adhesion between the sheet and the strip and at the same time sealing the apertures 19.

It will be appreciated that this method is not confined to the joining of sheet .celluloid. Other materials having certain characteristics in common with celluloid may be joined in a like manner, and it is not essential that the two sheets being joined be of the same material.

The connections produced by practicing the method of this invention are of sightly appearance and require little work in referred to may be any combination of acetones, ketones, acetates, or in fact any cutter of a spirit nature which combined or alone will dissolve celluloid. Measurably good results may be had by employing a li uid which is not a solvent of the celluloi providing that the liquid is capable of effecting adhesion between the celluloid surfaces.

I claim:

1. A method of joining two surfaces along a narrow area which consists in m tegrally unionizing said surfaces with the opposite faces of a narrow interposed filler strip by the application of a substance to the faces of the strip which is a solvent both of the material composing the strip and of one of the surfaces being joined.

2. A method of joining two surfaces along a narrow area which consists in integrally unionizing said surfaces with the opposite faces of an arrow interposed filler strip by the a plication of a substance to the faces of t e strip which is a solvent both of the material composi the strip and of the surfaces being join fi.

3. A method of joining a surface of celluloid to another surface of material along a narrow area which consistsin inter osing between and securing to said surfiices a narrow strip of celluloid, the stri being secured to the surface of celluloid by the application of a celluloid solvent.

4. method of joining two surfaces of celluloid along a narrow area from at least one side of which both surfaces are intended to extend in substantially contiguous relation which consists in interposin between said surfaces a narrow strip of ce uloid and then applying thereto a celluloid solvent.

5. A.method of joining two sheets of celluloid along a narrow area to form an edge seam which consists in interposin between said sheets a narrow filler strip 0 celluloid which is placed flush with the edge of one of the sheets and is s aced from the edge of the other sheet, app in a celluloid solvent to the two exposerf efges of the strip, and trimming off the overlapped portion of the last mentioned sheet.

6. A method of joining two surfaces over a particular area which consists in integrally unionizin said surfaces with the opposite faces 0 a thin filler member having the form of the desired area by the ,a plication of a substance to the faces of tiie filler member which is a solvent of the material composing the filler member and of one of the surfaces being joined.

7. A method of joining two surfaces over a particular area from at least one side of which both surfaces are intended to extend in substantially contiguous relation which consists in integrally unionizing said surface with the opposite faces of a thin filler member having the form of the desired area by the application of a substance to the faces of the filler member which is a solvent of the material composing the filler member and of the surfaces being joined.

8. In an article of manufacture, two sur faces of material disposed in substantially contiguous relation, and a connection between the surfaces over a particular area consisting of a thin interposed filler member which has the form of the particular area and is integrally unionized at its opposite sides with the two surfaces by the action of a solvent of the material composing the filler member and the surfaces.

9. In an article of manufacture, two sheets of celluloid disposed in substantially conti uous relation, and a narrow connection correspondingly narrow thin interposed filler strip of celluloid which is integrally unionized at its opposite faces with the two sheets by the action of a celluloid solvent.

In testimony whereof I have hereunto subscribed my name.

GROVER PERRY.

etween the surfaces consisting of a 

